The purpose of the study was to investigate the effect of choice and community involvement on quality of life in adult with intellectual disablilities, and to lay a ground for a wholistic intervention to promote quality of life in the disabled intellectually. For these purposes, the researcher surveyed 247 clients who lived in Sung Nam and analyzed the data to examine the effects of various factors on choice, community involvement, quality of life, and other related variables. The major results and implications for social work practice are as follows; First, among the factors in community involvement examined, a factor, community service, had a positive relationship with quality of life in adult with intellectual disablilities. Second, age and susso had a positive effect on quality of life in adult with intellectual disability. Third, it turned out that activity frequency and access were positively related to quality of life in the intellectual disabled. In summary, the study confirmed that choice, which is comprised of community service, and community involvement, which is made up of activity frequency and access, had a significant relationship on quality of life in adult with intellectual disability, controlling for sex, age, and three related factors. These result call for a social work practice that focuses on strengthening such factors, as practitioners attempt to improve quality of life in the intellectual disabled. A variety of intervention measures that take activity frequency, access, and community service into consideration can be developed as an alternative model of practice.